Help to understand a sentence ... High School Biology...

DNA is a chain of deoxyribonucleotides, and the order in which the base pairs are arranged contains genetic information; mRNA is transcribed from DNA and contains genetic information; Proteins are translated from DNA transcription mRNA; Small molecules of amino acids only form peptide chains, proteins, and contain genetic information, in the same way nucleotides only form nucleotide chains to have genetic information. Small molecules they are the basic components that make up the chain.

First of all, the DNA component is deoxyribonucleic acid.

RNA is ribonucleic acid.

Nucleotides are ribose or deoxyribose plus nucleic acids.

The amino acid sequence is actually the order in which amino acids are arranged, in fact, the components are the same as all the above components of RNA, as long as the quantity is sufficient, it can show a complete genetic information.

We know that generally speaking, the genetic information of organisms is stored in DNA, which is transcribed by RNA, and then RNA goes to find the corresponding amino acids to form proteins.

To be honest, I am a little skeptical of your conclusion, that is, how can amino acids contain genetic information, if it is a small molecule protein, all this can be achieved by the reverse process, so the first half of the sentence is easy to understand, but amino acids exist in nature, which is a bit puzzling.

Small molecule amino acids' nucleotides are the basic units of macromolecular organic matter, which cannot carry genetic information, and the macromolecule after a certain combination of them has genetic information.

Several different units are arranged in different ways to store information.

For example, we all know that the information in the computer is stored in 1 and 0, which is information, but a single 1 and a separate 0 are not information.

ps, deepen the concept of information: for example, if you use 1111000 to indicate your birthday, 1111001 to represent my birthday, and the third birthday may have different permutations and combinations, each corresponding to something else, which is information.

Genetic information is the sequence of amino acids and nucleotides, and small molecules cannot be reflected.

1.The proteins of an organism must be synthesized on the ribosomes of its own cells.

Viruses use the ribosomes of the host cell to synthesize proteins.

2.Hormones such as insulin leave the cells in the form of exocytosis and diffuse throughout the body fluids.

Some hormones are fat-soluble and do not leave cells through exocytosis.

3.The continuous production of new blood cells by the red bone marrow belongs to the homeostatic regulation of the internal environment.

The internal environment refers to the fluid environment in which the extracellular fluid constitutes and does not include red blood cells.

1. Golgi membrane and cell membrane.

Disconnected, the endoplasmic reticulum membrane is connected to the cell membrane;

2. For the synthesis and secretion of auxin, the cell membrane shows both fluidity and selective permeability;

3. Leaves mainly absorb red-orange light and blue-violet light, and green light absorbs less, so green light is reflected and refracted while red light and blue-violet light are absorbed, and the ratio of chloroplast is the smallest.

1.Proteins of the virus are synthesized within the host cell.

2.Sex hormones belong to the class of lipids through diffusion form.

3.Cells are not components of the internal environment.

1.Viral proteins are synthesized in host cell ribosomes.

2.Sex hormones are sterols, which are fat-soluble small molecules that diffuse freely out of cells.

3.The internal environment is made up of extracellular fluid, including plasma, interstitial fluid, and lymph, and excludes cells.

The first sentence is like a virus, nucleic acidViruses only have nucleic acids and proteins, and they must live in living cells and rely on the ribosomes of living cells to synthesize their own proteins.

The second sentence is that insulin is not a hormone, it is an enzyme.

The third sentence does not belong to the internal environment, because it is not lymphatic in the plasma interstitial fluid.

1, similar to parasitism, the DNA is injected into the host, and the host's amino acids are used to synthesize proteins 2, hormones may also only act on parts, such as synapses 3, blood cells are made by hematopoietic stem cells to be precise, and blood cells do not belong to the internal environment, the internal environment refers to the extracellular fluid in the human body (in the body of higher multicellular animals), and the internal environment is the extracellular fluid, mainly including lymph, plasma and tissue fluid. Whereas, red blood cells and plasma are both substances that belong to the blood.

First sentence: The endoplasmic reticulum membrane is connected inward to the nuclear membrane and outward to the cell membrane.

Sentence 2: Biofilms are structurally and functionally linked.

Sentence 3: The proportion of green light passing through chloroplasts is the largest in sunlight.

Both reflection and transmission are the largest proportion of green light).

How tall are you, **, are you going to add creatures?

The entrance examination is not the same as the college entrance examination.

If you want to tidy up, add QQ

Select item d. In item D, glucagon is secreted by pancreatic islet A cells (a type of cell in the endocrine part of the pancreas), and growth hormone is secreted by pituitary cells, all of which are endocrine gland cells in the human body, and because they are all proteins, they are all secreted by exocytosis, that is, efflux.

In item A, salivary amylase is a digestive enzyme, which is secreted by salivary gland cells, and antibodies are secreted by plasma cells.

The islets of item b are endocrine glands, and acetylcholine is secreted by nerve cells through exocytosis, but nerve cells are not human endocrine glandular cells.

Item C thyroid hormone is secreted by thyroid cells through exocytosis, but interferon is secreted by white blood cells through exocytosis, not by human endocrine glandular cells.

After processing by phagocytic cells, antigen-MHC complexes are formed and epitopes are exposed.

Pairing with receptors on lymphocytes discriminates epitopes.

MHC is a rejection reaction that occurs when tissue transplantation is performed between individuals of different species or the same lineage, which is essentially an immune response induced by allotypic antigens on the cell surface. This kind of allotypic antigen that represents individual specificity is called a transplant antigen or histocompatibility antigen, in which the antigen that can cause strong and rapid rejection is called the major histocompatibility antigen, and the antigen that causes the weaker rejection is called the secondary histocompatibility antigen.

Even if it is destroyed by T cells, it is normal, and these three types of cells are abnormal cells.

1: Nerve cells, muscle cells. Because it takes a lot of cells to complete this process.

2: Reflector Light does not pass through the aperture completely.

Do you still use mirror-type microscopes in high school? I haven't used this mirror in years.

Reflex arc Because differentiated cells form various tissues and organs, forming a reflex arc, tissues and organs cooperate closely. Aperture: This occurs because the aperture is not aligned with the aperture.